[Bug 883919] Re: NFS mount during startup causes excessive memory usage

[GeniusDex]

Got some more info after a few days of use.

The memory usage increase always takes up about 1.1 GB and then the
increase stops. It does not matter whether i first mount it using auto-
mounting at boot or do it via a user-script in startup; in both cases,
the memory usage increases. While the memory is increasing i cannot
unmount the device:

umount.nfs: /data: device is busy
umount.nfs: /data: device is busy

Once it's done increasing, i can unmount and re-mount the filesystem and
the memory usage does not increase.

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Title:
  NFS mount during startup causes excessive memory usage

Status in “nfs-utils” package in Ubuntu:
  New

Bug description:
  I just installed Kubuntu 11.10 with kernel 3.0.0.12.14 and nfs-common
  1:1.2.4-1ubuntu2 . I added a line to fstab (see below) to mount my NFS
  filesystem automatically on boot. Now, when rebooting the memory usage
  of my system keeps increasing indefinitely. In 15 minutes i went from
  1.0GB to 2.2GB of usage while only using firefox (using 150MB) and
  some terminals. The running processes did not significantly consume
  more memory during that 15 minutes, so it must be used in the kernel.

  When i unmount the NFS filesystem the memory usage of the whole system
  drops back to the original 1.0GB. Re-mounting it from user space does
  not start the increase of memory usage again. In both cases (original
  mount and re-mount) using the NFS filesystem works just fine. I'd
  expect the memory usage to stay low as well, regardless of how the
  filesystem is mounted.

  The fstab line is:
  elephant.local:/data                      /data           nfs     defaults,user   0       0

  The server-side options for NFS are: rw,no_subtree_check,async

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: nfs-common 1:1.2.4-1ubuntu2
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  Date: Sun Oct 30 19:09:11 2011
  InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  ProcEnviron:
   LANGUAGE=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: nfs-utils
  UpgradeStatus: No upgrade log present (probably fresh install)

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